热点(或热柱)还不能配合构造格架及地球化学格架来解释地幔演化。热点是地幔中相对固定的、长期的热异常,为海洋岛屿及大陆内部提供富集各种痕量元素的岩浆。从地幔作用过程和地幔化学演化来看,碱性火山岩虽然不如深海拉斑玄武岩丰富,但是,与热点伴生的碱性火山作用却是十分重要的过程。大洋地壳和岩石圈增生和俯冲的过程清楚地解释了大部分物质出入上地幔,而且洋脊玄武岩的研究对正在提供这些岩浆的那部分地幔提出重要的 Hotspots (or hot columns) have not yet been able to explain the evolution of the mantle by tectonic frameworks and geochemical shelves. Hotspots are relatively fixed, long-term thermal anomalies in the mantle, providing magma enriched with various trace elements for marine islands and the interior of the continent. In view of mantle action process and mantle chemical evolution, although alkaline volcanic rocks are not as rich as deep-sea tholeiitic basalts, alkaline volcanism associated with hot spots is a very important process. The processes of oceanic crustal and lithospheric hyperplasia and subduction clearly explain most of the material exiting the upper mantle, and the study of oceanic basalts makes an important contribution to the part of the mantle that is providing these magmas